http://www.instructables.com/id/Stay-Entertained-on-Long-Bus-Rides/step5/Pencil-Paper-FUN/Rate to Unit Rate
If there's 6 girls per 2 boys, how many girls if there's only 1 boy?
There are 10 chair per 5 tables, how many chair if there's only 1 tables?
Unit Rate to Rate
If there's 2 papers per pencil, how many papers if there's 10 pencil?
There are 20 apples per milk, how many apples if there's 6 milk?